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Old 01-10-2015, 10:59 AM   #7
waddenkruiser
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City: Southern Baltic
Vessel Name: Sømarken
Vessel Model: AMS 40'
Join Date: Jul 2012
Posts: 188
I'm not familiar with the Albin, but with the FL 120. We had one on our old boat and have now two on our AMS trawler, so we have got some operation experience with them.

Every continuous operation in the range of (1250) 1400 to 1800 rpm is fine for the FL120.
We NEVER operated them outside of this range for more than 5-10 minutes!

In the engine handbook a minimum continuous speed of 1250 rpm is indicated. However we found that after ~ 10 hours running at 1250 rpm the engine was starting to soot (1 hour at 1700-1800 rpm recovered that). Above 1400 rpm we have never had that sooting effect.

At 1725 rpm I would expect a fuel consumption of ~7.8 l/h (normal propulsion load curve). With a speed of 7-7.1 knots you would have something around 3.4 nmpg.

I'm not sure whether your readings 1725 rpm @ 7.1 kn is normal for an Albin 36 with a single FL120.

Recalculating some standard figures on Albin 36 I found in the www I wouldn't regard these 1725/7.1 as very unreasonable. From that point you should be able to cruise 6.3 kn @ ~1400 rpm with 5.2 nmpg without any negative effect on your engine.




best regards / med venlig hilsen
wadden
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best regards / med venlig hilsen
Wadden
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